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Understanding recent biogeographic responses to climate change is fundamental for improving our predictions of likely future responses and guiding conservation planning at both local and global scales. Studies of observed biogeographic responses to 20th century climate change have principally examined effects related to ubiquitous increases in temperature – collectively termed a warming fingerprint. Although the importance of changes in other aspects of climate – particularly precipitation and water availability – is widely acknowledged from a theoretical standpoint and supported by paleontological evidence, we lack a practical understanding of how these changes interact with temperature to drive biogeographic responses....
We conducted detailed resurveys of a montane mammal, Urocitellus beldingi, to examine the effects of climate change on persistence along the trailing edge of its range. Of 74 California sites where U. beldingi were historically recorded (1902–1966), 42 per cent were extirpated, with no evidence for colonization of previously unoccupied sites. Increases in both precipitation and temperature predicted site extirpations, potentially owing to snowcover loss. Surprisingly, human land-use change buffered climate change impacts, leading to increased persistence and abundance. Excluding human-modified sites, U. beldingi has shown an upslope range retraction of 255 m. Generalized additive models of past distribution were...
Wrangell-St. Elias is experiencing rapidly increasing development along the McCarthy Road and in the McCarthy-Kennecott area; a major component of the increase was the National Park Service's acquistion of the historic Kennecott Mill Site in 1998. As a result, the area has recently experienced road improvements, increased tourist traffic, construction of new visitor facilities, and new construction on and development of private properties. These factors have a strong potential to negatively affect the resident bear populations and to dramatically increase the number of bear-human conflicts. At this time, we have the opportunity to collect biological and ecological data that can be used to mitigate or eliminate some...
Categories: Publication; Types: Citation
Understanding the environmental contributors to population structure is of paramount importance for conservation in urbanized environments. We used spatially explicit models to determine genetic population structure under current and future environmental conditions across a highly fragmented, human-dominated environment in Southern California to assess the effects of natural ecological variation and urbanization. We focused on 7 common species with diverse habitat requirements, home-range sizes, and dispersal abilities. We quantified the relative roles of potential barriers, including natural environmental characteristics and an anthropogenic barrier created by a major highway, in shaping genetic variation. The...
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Wrangell-St. Elias is experiencing rapidly increasing development along the McCarthy Road and in the McCarthy-Kennecott area; a major component of the increase was the National Park Service's acquistion of the historic Kennecott Mill Site in 1998. As a result, the area has recently experienced road improvements, increased tourist traffic, construction of new visitor facilities, and new construction on and development of private properties. These factors have a strong potential to negatively affect the resident bear populations and to dramatically increase the number of bear-human conflicts. At this time, we have the opportunity to collect biological and ecological data that can be used to mitigate or eliminate some...
WRST BirdRec database. Database compiled by Karin Kozie and consists of all bird sightings not already cited in reports or publications (up to 1996). WRST-2006; 143169; Physical: WRST wildlife biologist's office
Categories: Publication; Types: Citation
Wrangell-St. Elias is experiencing rapidly increasing development along the McCarthy Road and in the McCarthy-Kennecott area; a major component of the increase was the National Park Service's acquistion of the historic Kennecott Mill Site in 1998. As a result, the area has recently experienced road improvements, increased tourist traffic, construction of new visitor facilities, and new construction on and development of private properties. These factors have a strong potential to negatively affect the resident bear populations and to dramatically increase the number of bear-human conflicts. At this time, we have the opportunity to collect biological and ecological data that can be used to mitigate or eliminate some...
Categories: Publication; Types: Citation
In a rapidly changing climate, effective bird conservation requires not only reliable information about the current vulnerability of species of conservation concern, but also credible projections of their future vulnerability. Such projections may enable managers to preempt or reduce emerging climate-related threats through appropriate habitat management. We used NatureServe’s Climate Change Vulnerability Index (CCVI) to predict vulnerability to climate change of 168 bird species that breed in the Sierra Nevada mountains of California, USA. The CCVI assesses species-specific exposure and sensitivity to climate change within a defined geographic area, through the integration of (a) species’ range maps, (b) information...
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Executive Summary: We provide an analysis of Sonoran Desert water network connectivity to inform managers of current conditions for target wildlife and how the connectivity will change as the landscape becomes more water limited.Climate change is expected to lead to fragmentation of the network, increasing coalescence distance by 8% and reducing the persistence and overall number of waters on the landscape. Identification of key water sites, ranked by network connectivity metrics, are presented in Appendix B. Wetland number under our scenario of water limitation will decline by 43% reducing network resilience.Anurans and Caudates, although varying in ability to disperse, generally experienced reduced connectivity...
Climate refugia management has been proposed as a climate adaptation strategy in the face of global change. Key to this strategy is identification of these areas as well as an understanding of how they are connected on the landscape. Focusing on meadows of the Sierra Nevada in California, we examined multiple factors affecting connectivity using circuit theory, and determined how patches have been and are expected to be affected by climate change. Connectivity surfaces varied depending upon the underlying hypothesis, although meadow area and elevation were important features for higher connectivity. Climate refugia that would promote population persistence were identified from downscaled climate layers, based on...
    map background search result map search result map Gates of the Arctic Winter 2012-2013 Weather Summary Anaktuvuk Pass vegetation study: disturbed sites Enumerating brown and black bear populations using non-invasive genetic sampling and documenting and mitigating bear conflicts in the McCarthy-Kennecott area of Wrangell-St Elias National Park and Preserve (MS Research Proposal) Quantitative and Predictive Analysis: Landscape Connectivity of Isolated Waters for Wildlife in the Sonoran Desert Gates of the Arctic Winter 2012-2013 Weather Summary Anaktuvuk Pass vegetation study: disturbed sites Enumerating brown and black bear populations using non-invasive genetic sampling and documenting and mitigating bear conflicts in the McCarthy-Kennecott area of Wrangell-St Elias National Park and Preserve (MS Research Proposal) Quantitative and Predictive Analysis: Landscape Connectivity of Isolated Waters for Wildlife in the Sonoran Desert